http://knexinnovation.net/showthread.php?1064-Big-Electric-Motor(Fast!)
Improved output device for the Single Inductor Bipolar Energizer circuit. External triggering used to allow 180 degree coil disposition(series-connected) with options for testing at 90 and 45 degrees.
Rotor speed is stable at 4720 RPM, about 2 Watts consumed from the power supply while idle and under load. Stator is air-core.
using: 3/4 in x 3/4 in Cylinder with 1/4 in. Hole, Diametrically Magnetized. Very good fit to most K'nex components ;)
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